三、磷肥的增产效果和施用技术施磷肥以调整作物磷素供需平衡,对作物生长发育有良好影响,从而大幅度地增产,而磷肥效果高低,与合理施用技术有密切关系。(一)磷肥对主要作物的增产效果各种作物缺磷的症状,可作看苗诊断来施用磷肥。据观察,小麦缺磷时,叶鞘和叶片呈紫红色,严重者从下层 Third, the effect of phosphorus fertilizer production and application of technology P fertilizer to adjust crop phosphorus balance, crop growth and development have a good impact, which greatly increased production, and the level of phosphate fertilizer, and the rational application of technology are closely related. (A) of the phosphate fertilizer on the main crops yield effect A variety of crop phosphorus deficiency symptoms, can be used to diagnose seedlings to apply phosphate fertilizer. It is observed that when the wheat is deficient in phosphorus, the leaf sheaths and leaves are purplish red, while the severe ones are from the lower layer